2000 150hp. My engine was creeping down on trim but it would hold the tilt. I went to check the fluid level (engine locked in the up position) and it was like there was too much in it. Some poured out. After that the engine will not tilt but it still will trim (smoothly) . Do I have an air pocket somewhere or what? I have tried to bleed it out. I still cannot add any fluid to it.